非等温表面Marangoni凝结特性的研究  

Study of Marangoni Condensation Characteristics on Non-isothermal Surfaces

作　　者：胡申华[1,2] 严俊杰[2] 王进仕[2] 

机构地区：[1]新疆大学电气工程学院,乌鲁木齐830047 [2]西安交通大学能源与动力工程学院,西安710049

出　　处：《动力工程学报》2012年第1期27-30,共4页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(50966003);新疆大学博士启动基金资助项目(BS090147);教育部科学技术研究重点资助项目(211197)

摘　　要：在带有温度梯度的凝结表面上进行了一系列质量分数酒精蒸气的Marangoni凝结试验,研究了酒精蒸气的传热系数.结果表明:与日本学者Utaka的试验数据相比,质量分数为99%的水和1%酒精混合蒸气在同样试验条件下(p=84.5 kPa、v=2 m/s)的传热系数提高了15%;在相似的试验条件下,带温度梯度试验块其传热系数的提升是由于液膜内部存在两种相反的运动,这两种相反运动扰乱了凝结液膜,从而减小了液膜的热阻;对传热系数随过冷度变化的规律进行了定性分析.Experimental tests were performed on Marangoni condensation heat transfer of ethanol-water mixtures with different concentrations on a surface with temperature gradient.Results indicate that for the mixture with a mass concentration of 1% ethanol and 99% water,the heat transfer coefficient can be raised by 15%,under same experimental conditions（p=84.5 kPa,v=2 m/s）,compared with that of Utaka experiment.Under similar experimental conditions,the improvement of heat transfer coefficient of test block with temperature gradient is found to be caused by existence of two reverse motions in the condensation film,which disturbs the condensation film and hence reduces its heat resistance.Moreover,qualitative analysis is also carried out to study how the heat transfer coefficient varies with the degree of supercooling.

关 键 词：凝结 强化 液膜热阻 水-酒精混合蒸气 斜块 

分 类 号：TK121[动力工程及工程热物理—工程热物理]